Valve construction



May 27,, 1952 l. T. ROSENLUND VALVE CONSTRUCTION Filed Sept. 2, 1947INVENTOR. M m

Patented May 27, 1952 VALVE CONSTRUCTION i 1 Her Theodore Rosenlund,Newark, Del.,'assignorto PackardMotorCa'r Company, Detroit; Mich; I acorporation of Michigan Application September 2, 19.47, SerialN'o.771,730

1 Clainn (Cl. 137-139) I The simple check valve most commonly em.-.ployed for insuring that the :direction of flow of fluid through aconduit may-not be inadvertently reversed comprises a bodythrough whichthe con-V duit extends and which is=provided with a valve seatencircling theport atthe discharge end of. thatconduit, together with avalve and a spring,..

the spring acting on the valve in such manner as to maintain. it inseated position until. the pres-- sureof the liquid against thevalveovercomes the action of the spring, .whereuponfluid flows from thedischarge port of the liquid conduit and continues to flow until theliquid pressure .falls oiT and the spring, is again able tomove thevalveto seated position.

The present invention comprisesan-improvementrupon check-valves of thisgeneral. nature,

having a number of features of novelty which render it more reliable inlong continued use and also "more compact, simpler, and lighter thanearlier types of check valves. In accordance with the invention the useof springs or other resilient devices is dispensed with and there isemployed, for the purpose of maintaining the valve normally seated,a-permanent magnet; This permanent magnet is of such character as tomaintain the associated valve firmly upon its seat unless and until" thevalve is unseated owing to a substantialgincrease-inrpressure'of'thefluid in the fluid conduit which the valvenormally closes.Unseating of-the'valve under-the influence of fluid pressure results'inits movement away from the permanent magnet totheextentnecessary'topervmit'escapeof Liquid from the ductbut thismovement is'not" so great that the valve passes out of the field of thepermanentmagnet. Other portions of the valve assembly, adjacent thevalve proper-,are fabricated of non-magnetic material inorder that therelationship between the valve and the permanent magnet provided forthe-purpose of maintaining it normally seated may not be disturbed.

Preferably the permanent magnet is provided with a facing layer ofnon-magnetic material which encircles the discharge port of the fluidduct, the valve making contact with such nonmagnetic layer instead ofdirectly with the mag net. This facing layer is fabricated ofnon-magnetic material and is preferably so shaped that the movement ofany magnetic particles which may come into contact with it toward thebore of fluid conduit in the permanent magnet is facilitated', thefacing layer of non-magnetic material-for instance having a valveseating surface which is outwardly flaring or frusto-conical so ithatsuch particles mayv be guided inwardly-toe ward the fluid duct 1asthey move along. the surface under the influence of themagneta Becauseof its reliability, smallsize-simplicity and durability in service thecheck valve is..par-

ticularly suitable. .inuse in. association with. fuel. supply systems,for. internalscombustion engines. The valve per seis .lightin weightand the-pull. of the permanent magnet isrelatively,strongsothat thevalve will remainseated fandwill .func:

tionperfectly regardless. of the position inwhi'ch. the valve body iasla.wholemay be. .placed, i. .e. whether the valve-is below,.beside,orlabove its.

seating surface. Itmay be .readily,and..conven-.

iently applied at various. places. in the-fuel supply. system of anengine-as, for instance to thefuel. nozzle of such an. engine, where itwill serve-to prevent dripping when. the engineis not inopera: tion, or.when theengineislbeing started but.b.e.-.

fore thefuel pressure has increased tothe-point where a satisfactoryspray can .be prpjecte.d--....

Inthe accompanying drawings the valve, is dis-.. closedin associationwith the fuelnozzle That.

embodiment of the valve which .has. been selected for illustrationis,.,it willbe appreciated, shownby. way of example only.

In the drawings: Figure 1 is a r-longitudinal.,o1:.:,axial. sectiothrough the improved-check valve, aportion .of.

the fuel nozzle with which it .hasbeen illustrated being also showninaxial sectionaande Figure 2 is a section on line 2+2 of Figure. 1.

Thebody of the'check valve selected for.:illus tration includes two--portions, ;the...outer body: member 10: and the, inner body member I I..The

outer body member. is generally cylindrical, .Jis fabricated ofnon-magnetic material, andhas-an.

axial recess l2 extending into the same from one. end surface, this,.recess :communicating. with .;an

axial bore 13 of.ireducedvdiameter. whichlcome.

prises a-fuel delivery duct. Within the recess I2 is located the innerbody member or permanent magnet H previously referred to, these membershaving threaded relation and the magnetic core member I l being providedwith a head portion l5 shaped as a nut and by means of which it may beconveniently rotated in originally assembling the parts and whichfacilitates removal of the magnetic core from time to time as may benecessary for inspection 01' replacement. The bottom of the recess I2 inthe non-magnetic member ID is frusto-conical as shown, and is providedwith a series of radially disposed raised ribs Hi.

The inner end of the core II is frusto-conical, although tapering in adirection diametrically opposed to the direction of taper of the bottomsurface of the recess I2. A facing layer of nonmagnetic material isindicated at II, this facing layer being frusto-conical and covering andresting upon the frusto-conical face of the inner end of the core I I.It may be fabricated of stainless steel, neoprene or other plasticcomposition, brass, aluminum, or in fact of any other nonmagneticmaterial which is sufliciently durable and which will maintain smoothcontinuous contact with a valve such as the steel ball 20, during thelife of the check valve. circles the discharge port 2| of the fluid duct22 formed in the permanent magnet, the valve 20 normally occupying theposition in which it is shown in Figure 1, making close contact with theseating surface of the facing layer I1 and beingv maintained in thatposition by the action of the permanent magnet. If the pressure of thefluid in duct 22 rises sufiiciently, however, the ball 29 will bedisplaced and fluid will flow into the valve chamber intermediate theend of core I I and the bottom of the chamber I2, thence through thedischarge duct I3 in member I0.

It will be observed that the ball valve 29 may not move very far fromits seating surface before it comes into contact with one or more of theribs I6 and these ribs are so located with relation to the seatingsurface that, when the ball valve has been moved to the limit of itstravel away from the seating surface it will still be within the strongfield of action of the permanent magnet I I so as to be automaticallyrestored to port closing position when the pressure of the liquid induct 22 falls. The members I0 and Il thus define a valve chamber whichis of such size and dimension as to permit the necessary movement of thevalve under the influence of fluid pressure but at all times so confinesthe valve that it is subject to the influence of the magnet, the ribsI6, of course, insuring that fluid may flow from the valve chamber intothe duct I3 when the valve is unseated, preventing seating of the valveagainst the bottom of the recess [2 and closing of the delivery duct.

The check valve is shown in association with a fuel nozzle and thisnozzle comprises essentially the tip or discharge portion 25 and asleeve 28, the cylindrical end 2'! of the tip 25, which is of reduceddiameter, being threaded and being received within the threaded end ofthe sleeve. Tip and sleeve are preferably of non-magnetic material. Theouter member ID of the valve body is threaded into the sleeve 26, itsinner end closely engaging or being positioned close to the end of thereduced portion 21 of the tip and the duct I3 of the valve bodyregistering with duct 28 of the tip.

It will be appreciated that the improved check valve can be associatedwith other types of fuel The facing I! endistributing appliances and mayotherwise be advantageously employed.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

A check valve for multi-directional positioning comprising, incombination, a valve body having a valve chamber and inlet and outletfluid ducts formed therein, one of said ducts terminating in a port inthe wall of said chamber, a frusto-conical surface of the chamber wallencircling said port and comprising a seating surface for a valve, aportion of said body in rear of said seating surface comprising apermanent magnet, the remainder of said body being of nonmagneticmaterial, a ball valve element within said chamber adapted to engagesaid valve seat and close said port, said valve element being made ofmaterial which is attracted by said magnet and being maintained therebyfirmly in seated position until displaced by fluid forced through saidport, and abutment means in said valve body for confining the movementsof the valve element to the field of attraction of the magnet, saidfleld being of sufficient strength to return the ball valve to its seatin the absence of valve-displacing fluid pressure whatever the positionof the valve body, while permitting flow of fluid through said valvechamber and the other of said ducts beyond the valve element, saidfrustoconical seating surface being comprised of an outwardly flaringrelatively thin layer of nonmagnetic material, the permanentlymagnetized portion of the valve body directly underlying said layer,said frusto-conical seating surface tapering toward said port so as toguide any magnetically attractable particles over said seating surfaceand into said duct.

IVER THEODORE ROSENLUND.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 685,549 Wurts Oct. 29I'1901-912,576 Kelley Feb. 16, 1909 1,319,787 Moran Oct. 28, 1919 2,250,813 ReaJuly 29,, 1941 2,294,568 Neilson Sept. 1, 1942 2,313,564 Manly Mar. 9,1943 2,374,895 Ray May 1, 1945 2,400,817 Fox May 21, 1946 2,495,127Beach Aug. 6, 1946 FOREIGN PATENTS Number Country Date 74,521 Austria of1917 439,138 Great Britain of 1935

